docs: add guide — Deploy a simple Rig agent on Oasis ROFL

[ZigaMr]

Summary

Adds a new deployment guide to help Rig users run a simple containerized agent on Oasis ROFL, a decentralized runtime for verifiable and confidential apps.

What’s included

New doc: pages/guides/deploy/Blog_3_oasis_rofl.mdx
Brief intro to ROFL and why it’s relevant to Rig

Step‑by‑step flow:

Prereqs: Oasis CLI, Docker, model provider key
Service: minimal HTTP wrapper for a Rig agent (port 8080)
Containerization: example Dockerfile (Rust) and compose.yaml
ROFL init: oasis rofl init, set rofl.yaml resources
On-chain registration: oasis rofl create --network testnet
Bundle: build .orc with oasis rofl build
Secrets: oasis rofl secret set OPENAI_API_KEY -
Deploy: oasis rofl deploy --network testnet
Verify: machine show, machine logs, sample curl

Troubleshooting and references:

ROFL quickstart/prereqs, demo app structure, and optional ROFL Rust client link

Audience and scope

Written for Rig users unfamiliar with Oasis/ROFL.

Focused on deployment with the Oasis CLI (not ROFL client APIs).
Language‑agnostic; Rust shown as example, easily adaptable.

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